Even if there are active Management entitlements in the account, the system registration fails with "Error Class Code: 91 ".

Resolution

If there are no active or free Management Entitlements, then additional Management entitlements will need to be purchased to continue using activation keys.

If this issue is seen without using Activation Keys to register a system, it might be possible that there is an activation key in RHN account which is set as a "Universal Default". In this case, RHN would try to apply the default key to any system registering to RHN Classic, leading to the error. Removing the Universal Default setting of the activation key would allow the registration of systems without using a key and without purchasing more Management entitlements. To do this, follow these steps:

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